| Early to bed, early to rise, makes a
man healthy, wealthy (富有的) and wise (聪明的). This is an old English saying. Have you ever heard it before It means that we must go to bed early and get up early in the morning. Then we shall be healthy, and we shall also be rich and clever. This is true. The body must have enough sleep to be healthy. Children at young ages should have ten hours’ sleep every night. Children who do not have enough sleep can not do their work very well. They will not be clever and they may not become rich. The body also needs exercise. Walking, running, jumping, swimming and playing games are all exercise. Exercise keeps the body strong. Exercise also helps the blood (血液) to move around inside the body. This is very important. Our blood takes food to all parts of our body. The head also needs blood. Exercise helps us to think [简答题]Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn’’t know for sure That the evidence was inconclusive, the science uncertain That the antismoking lobby was out to destroy our way of life and the government should stay out of the way Lots of Americans bought that nonsense, and over three decades, some 10 million smokers went to early graves.
There are upsetting parallels today, as scientists in one wave after another try to awaken us to the growing threat of global warming. The latest was a panel from the National Academy of Sciences, enlisted by the White House, to tell us that the Earth’’s atmosphere is definitely warming and that the problem is largely man-made. The clear message is that we should get moving to protect ourselves. The president of the National Academy, Bruce Alberts, added this key point in the preface to the panel’’s report: "Science never has all the answers. But science does provide us wit
A. A．they both suffered from the government’’s negligence. B．a lesson from the latter is applicable to the former. C．the outcome of the latter aggravates the former. D．both of them have turned from bad to worse. [填空题]钢轨包括道岔和调节器打磨分为预打磨、预防性打磨和( )性打磨。
[单项选择]中国人民武装警察部队设（）级领导机关。
A. 二 B. 三 C. 四 D. 五 我来回答: 提交
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